package com.bdqn.gulimall.order.config;

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**
 * Feign二次远程调用丢失请求头的问题
 */
@Configuration
public class GuliFeignConfig  {

    @Bean("requestInterceptor")
    public RequestInterceptor requestInterceptor(){

        return new RequestInterceptor() {
            /**
             * 解决丢失请求头的信息，将原请求的头信息，copy至新请求
             * @param requestTemplate
             */
            @Override
            public void apply(RequestTemplate requestTemplate) {    //requestTemplate新请求
                //1.RequestContextHolder拿到刚进来的请求数据，好比拿到了当前请求的request，session等等
                ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

                if(attributes!=null){
                    HttpServletRequest request = attributes.getRequest();   //老请求
                    if(request !=null){
                        //同步请求头数据，Cookie
                        String cookie = request.getHeader("Cookie");
                        //给新请求同步了老请求的cookie
                        requestTemplate.header("Cookie",cookie);
                    }
                }


            }

        };
    }

}
